Patch "drm/fsl-dcu: enable IRQ before drm_atomic_helper_resume()" has been added to the 4.14-stable tree

Patch "drm/fsl-dcu: enable IRQ before drm_atomic_helper_resume()" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/fsl-dcu: enable IRQ before drm_atomic_helper_resume()

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-fsl-dcu-enable-irq-before-drm_atomic_helper_resume.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 9fd99f4f3f5e13ce959900ae57d64b1bdb51d823 Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Fri, 10 Nov 2017 10:15:28 +0100
Subject: drm/fsl-dcu: enable IRQ before drm_atomic_helper_resume()

From: Stefan Agner <stefan@agner.ch>

commit 9fd99f4f3f5e13ce959900ae57d64b1bdb51d823 upstream.

The resume helpers wait for a vblank to occurre hence IRQ need
to be enabled. This avoids a warning as follows during resume:
  WARNING: CPU: 0 PID: 314 at drivers/gpu/drm/drm_atomic_helper.c:1249 drm_atomic_helper_wait_for_vblanks.part.1+0x284/0x288
  [CRTC:28:crtc-0] vblank wait timed out

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
@@ -232,6 +232,7 @@ static int fsl_dcu_drm_pm_resume(struct
 	if (fsl_dev->tcon)
 		fsl_tcon_bypass_enable(fsl_dev->tcon);
 	fsl_dcu_drm_init_planes(fsl_dev->drm);
+	enable_irq(fsl_dev->irq);
 	drm_atomic_helper_resume(fsl_dev->drm, fsl_dev->state);
 
 	console_lock();
@@ -239,7 +240,6 @@ static int fsl_dcu_drm_pm_resume(struct
 	console_unlock();
 
 	drm_kms_helper_poll_enable(fsl_dev->drm);
-	enable_irq(fsl_dev->irq);
 
 	return 0;
 }


Patches currently in stable-queue which might be from stefan@agner.ch are

queue-4.14/drm-fsl-dcu-avoid-disabling-pixel-clock-twice-on-suspend.patch
queue-4.14/drm-fsl-dcu-enable-irq-before-drm_atomic_helper_resume.patch